50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ScrollLinkedEffectDetector.h"
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#include "nsIDocument.h"
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#include "nsThreadUtils.h"
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namespace mozilla {
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namespace layers {
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uint32_t ScrollLinkedEffectDetector::sDepth = 0;
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bool ScrollLinkedEffectDetector::sFoundScrollLinkedEffect = false;
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/* static */ void
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ScrollLinkedEffectDetector::PositioningPropertyMutated()
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{
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MOZ_ASSERT(NS_IsMainThread());
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if (sDepth > 0) {
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// We are inside a scroll event dispatch
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sFoundScrollLinkedEffect = true;
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}
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}
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ScrollLinkedEffectDetector::ScrollLinkedEffectDetector(nsIDocument* aDoc)
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: mDocument(aDoc)
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{
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MOZ_ASSERT(NS_IsMainThread());
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sDepth++;
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}
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ScrollLinkedEffectDetector::~ScrollLinkedEffectDetector()
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{
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sDepth--;
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if (sDepth == 0) {
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// We have exited all (possibly-nested) scroll event dispatches,
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// record whether or not we found an effect, and reset state
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if (sFoundScrollLinkedEffect) {
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mDocument->ReportHasScrollLinkedEffect();
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sFoundScrollLinkedEffect = false;
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}
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}
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}
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} // namespace layers
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} // namespace mozilla
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